/**
 * Copyright (C) 2010-2013 Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.rocketmq.store;

import com.alibaba.rocketmq.common.protocol.heartbeat.SubscriptionData;

/**
 * 消息过滤规则实现
 * 
 * @author shijia.wxr<vintage.wang@gmail.com>
 * @since 2013-7-21
 */
public class DefaultMessageFilter implements MessageFilter {

	@Override
	public boolean isMessageMatched(SubscriptionData subscriptionData, long tagsCode) {
		// SubscriptionData对象为空
		if (null == subscriptionData) {
			return true;
		}
		// SubscriptionData.classFilterMode变量为true
		if (subscriptionData.isClassFilterMode())
			return true;
		// SubscriptionData对象的subString变量等于*
		if (subscriptionData.getSubString().equals(SubscriptionData.SUB_ALL)) {
			return true;
		}
		// SubscriptionData对象的codeSet集合包含tagsCode值
		return subscriptionData.getCodeSet().contains((int) tagsCode);
	}

}
